I have the same issue and I am using the Wyze Chime. I had my “My built-in house chime” setting set to “Mechanical”. I tried changing it to “None”, but it doesn’t fix the issue.
I don’t know what triggers the issue - for me it doesn’t seem related to any motion event. Sometimes it goes days without happening. Today, my doorbell has rung 4 times.
When someone actually presses the button on my Wyze Duo doorbell, I usually hear the mechanical doorbell ring, my Wyze Chime plays a sound, and my Alexa announces that someone is at the front door. When this bug occurs, I just get a “ding ding” from my mechanical doorbell (no Wyze Chime and no Alexa).
I’m wondering if the Wyze Duo is maybe rebooting and that simulates a classic “ring” to my mechanical doorbell. Or maybe it just randomly glitches and shorts the wires to simulate a classic doorbell press to my mechanical doorbell.
UPDATE: I just told my Wyze Duo to reboot from within the app, and a few seconds later I got the “ding ding” from my mechanical doorbell. So, maybe it is just a crash or reboot.